Audio frequency and signal strength sensor: is there such thing?
Hi, I'd like to know if there's a sensor easily used with an Arduino that detects the signal strength of a sound of frequency determined by me.
I want this to make a sensor that can be used to measure its distance to the emitting object omni-directionally, ie, not like ultrasonic or IR distance sensors, which only sense what's in front of them. I want the sensor to sense the SPACE AROUND it, like... spherically.
If you know of a sensor that does that in another way, I'd LOVE to hear about it. I've been searching for something like that for a long time...
Anyway, I just need a sensor - cheap, preferably :) - that senses the signal strength of a wave of frequency x.
By the way, the distance range to be measured is about 10 - 150cm...